[(0,1),(0,2),(2,3),(3,4),(1,5),(4,6),(5,7),(6,8),(3,8),(5,9),(7,10),(10,11),(9,12),(1,12),(10,13),(11,14),(2,15),(8,16),(7,17),(9,18),(6,19),(12,20),(4,21),(11,22)]
[(0,1),(1,2),(2,3),(0,4),(1,5),(4,6),(3,7),(5,7),(6,8),(2,9),(6,10),(8,11),(9,11),(4,12),(12,13),(12,14),(5,15),(7,16),(3,17),(8,18),(9,19),(10,20),(11,21),(10,22)]
